Launched by Italian brand Alessi in 1982, the kettle features two whistles, each tuned to a different note, so that a harmony is produced when water in the kettle boils.

"The idea of Sapper was very clear," Alberto Alessi explains in the movie. "He told me: 'I will design a kettle for you, but it's not enough for me to just design a beautiful kettle. I want to design a kettle that can be multi-sensorial. Not only to the eyes, but also to the ears'."

Alessi admits that the whistles do not always work perfectly, but insists that it has nothing to do with the object's functionality.